Question

stiind ca a x b=33 supra 121 si a x c=3 supra 11 calculati (b+c)xa si (b-c) xa

Answer 1

a * b = 33/121
a * c = 3/11
le adunam
a * b + a * c = 33/121 + 3/11
(b + c) * a = 33/121 + 33/121
(b + c) * a = 66/121 = 6/11

le scadem primele doua relatii de sus
a * b - a * c = 33/121 - 3/11
a * (b - c) = 33/121 - 33/121
a * (b - c) = 0